Welcome to GEO's Van (eastern Turkey) Event Website

The science coordinator for this event is Prof. Semih Ergintav of
Tubitak MRC Earth and Marine Sciences Institute, Istanbul.
If you have data or results that you would like to post on this webpage, please e-mail Falk Amelung, the Task Leader of GEO's Supersite initiative (famelung@rsmas.miami.edu) or Susanna Gross (supersites@unavco.org).

The more frequently the above images are acquired, the more we can learn about
the post-seismic strain field.

Unwrapped phase of the 2011/10/31-2011/11/30 ASAR-ENVISAT InSAR pair
(Postseismic, Track 121, IS6, Descending). The fringes close to the
epicentral area, on the west side of the Ercek Lake are likely
noteworthy. Data processing was carried out at the Istituto Nazionale di
Geofisica e Vulcanologia, the "Osservatorio Vesuviano" Naples branch
(INGV-OV), Italy, by Sven Borgstrom and Valeria Siniscalchi, with
Envisat raw data provided by the European Space Agency (ESA) in the
frame of the Supersites initiative. Results obtained with ROI_PAC 3.0.1
from JPL, with orbits from the ESA DORIS web service (preliminary orbits
for the Nov. 30, 2011 acquisition). The red star is the epicenter of the
M7.2 Van earthquake of October 23, 2011

Unwrapped phase of the 2010/11/05-2011/10/31 (track 121, IS6,
descending, right) and the 2011/07/22-2011/11/19 (track 394, IS6,
descending, left) ASAR-Envisat InSAR pairs. Data processing was carried
out at the Istituto Nazionale di Geofisica e Vulcanologia, the
"Osservatorio Vesuviano" Naples branch (INGV-OV), Italy, by Sven
Borgstrom and Valeria Siniscalchi with Envisat raw data provided by the
European Space Agency (ESA) in the frame of the Supersites initiative.
Results obtained with ROI_PAC 3.0.1 from JPL, with orbits from the ESA
DORIS web service (preliminary orbits for the Oct. 31, 2011 and Nov. 19,
2011 acquisitions). The red star is the epicenter of the M7.2 Van
earthquake of October 23, 2011

Coseismic Envisat interferogram of the combined descending tracks, 121
and 394. The images have been acquired on 2010/11/05 and 2011/10/31,
2011/07/22 and 2011/11/19 respectively. Processing was done by Hannes
Bathke within the framework of the PROGRESS project at GFZ Potsdam,
using the softwares ROI_Pac and Doris. Envisat data has been provided
through the Supersite. An image in a high resolution and a .kml file is
available ( here ).

Envisat ASAR interferogram showing coseismic displacement due to the Van
Earthquake. This interferogram was generated using two images acquired
from the descending orbit ,Track 121, on 2010/11/05 and 2011/10/31
provided by ESA. The DOR orbit was used to process the 2010 image and
POR orbit for 2011 acquisition. The baseline was reestimated during the
processing. ROI_PAC was used to process this interferogram. Each fringe
shows 2.8 cm of displacement in the line of sight direction. Processed
by Heresh Fattahi and Fernando Greene at InSAR-Lab, University of Miami.

Unwrapped phase of the 2010/11/05-2011/10/31 ASAR-Envisat InSAR pair
(track 121, IM Swath6, Descending Orbits). Data processing was carried
out by Sven Borgstrom and Valeria Siniscalchi at the Istituto Nazionale
di Geofisica e Vulcanologia, the "Osservatorio Vesuviano" Naples branch
(INGV-OV), Italy, with Envisat raw data provided by the European Space
Agency (ESA) in the frame of the Supersites initiative. Results obtained
with ROI_PAC 3.0.1 from JPL, with orbits from the ESA DORIS web service
(preliminary orbits for the Oct. 31, 2011 acquisition). The red star is
the location of the M7.2 Van earthquake of October 23, 2011.

Envisat interferometric (InSAR) map of coseismic displacements in the
radar line-of-sight (LOS, 41 degrees from vertical and roughly west).
Derived from Envisat ASAR (beam IS6, descending track 121) data acquired on 2010/11/05 and
2011/10/31. Precise POR orbits from ESA were used for data processing,
and one color cycle represents 2.8 cm of LOS displacements. Processed by
Sang-Ho Yun of the ARIA project at JPL-Caltech, using ROI_PAC. The
seismicity plot is from USGS Latest Earthquakes. Envisat original data (c) 2011 ESA, provided through this Supersite. Google Earth .kmz file available
here.

ENVISAT differential interferogram derived from the scenes acquired on
05/10/2010 and 31/10/2011, along descending orbits (Swath: IS6, Track:
121); one color cycle corresponds to about 2.8 cm displacement in the
radar line of site. The interferogram has been produced at IREA-CNR
(Napoli, Italy) by using the preliminary ENVISAT orbit products. ENVISAT
raw data have been provided by the European Space Agency. KMZ file

ENVISAT differential interferogram derived from the scenes acquired on
05/10/2010 and 31/10/2011, along descending orbits (Swath: IS6, Track:
121); one color cycle corresponds to about 2.8 cm displacement in the
radar line of sight. The interferogram has been produced at IREA-CNR
(Napoli, Italy) by using the satellite predicted orbits. ENVISAT raw
data provided by the European Space Agency.

TerraSAR-X:

Post-earthquake TerraSAR-X observations have been planned by the Charter.
The Supersites will acquire additional imagery in the following months
to resolve rapid post-seismic deformation. To download TerraSAR-X,
please see this simple index

Preliminary time-series analysis of postseismic
deformation following the Van earthquake using TerraSAR-X data. The negative
values in the time-series plot correspond to line-of-sight (LOS) subsidence
while the positive values correspond to LOS uplift.
The interferometric processing was done by DORIS software, developed by the
Delft Institute for Earth-Oriented Space Research (DEOS), Delft University of
Technology, and the time-series analysis was performed using the Small
Baseline approach implemented in Stamps software
(http://radar.tudelft.nl/~ahooper/stamps/index.html)

Mahdi Motagh of GFZ Potsdam made a TerraSAR-X interferogram using images
obtained November 9-20, 2011. The fringes
over Van city should be related to the big aftershock of Mw 5.6,
November 09, 2011 earthquake. Each color cycle corresponds to 1.5 cm of
displacement in the radar line-of-sight (LOS) direction.
This interferogram is also available as a geocoded TIFF and a KML file.

Mahdi Motagh of GFZ Potsdam made a TerraSAR-X interferogram using images
acquired on 20111029 and 20111109. Each fringe represents 1.5 cm of
displacement in the line-of-sight (LOS) direction of the satellite.
This interferogram is also available as a geocoded TIFF and a KML file.

COSMO-SkyMed:

Cosmo-SkyMed: At this time this sensor is not available for scientific
use by the Supersites community.

Coseismic displacement field, based on Turkish CGPS network:
TUSAGA-AKTIF. Basically, the CORS stations can constrain the fault
strike (between MORA and OZAL and through TVAN) - consistent with
the InSAR and focal mechanism. Figure contributed by Semih Ergintav of
the Earth and Marine Sciences Institute Gebze, Kocaeli, TURKEY. This first version of
the
coseismic field was calculated by Dr. Rahsan Cakmak
(TUBITAK MRC EMSI).

Strain

Earthquake Data

Ground Motion

Seismicity

Dr. M. Nurcan Ozel of B. U. Kandilli Observatory and Earthquake Research Institute
has written a Google Map animation of aftershocks, to illustrate the release of
seismic energy in the region. Click on the static image above to visit the
dynamic page.

Reports

Professor Serdar Akyüz's team (ITU) prepared a field report in English including high quality photos. It discusses the properties of surface deformation around the epicenter.

Professor Cetin and others at the Middle East Technical University,
Civil Engineering Department have written a report illustrating and
summarizing field observations of ground failure within 50 km of the
epicenter.

Links

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